Optics: image projectors – Temperature control
Patent
1977-11-16
1979-09-11
Stephan, Steven L.
Optics: image projectors
Temperature control
353 61, 353 78, G03B 2116, G03B 2128
Patent
active
041673107
ABSTRACT:
A lamp assembly and power module is provided for a microform display apparatus, such as a fanless microfiche reader. The lamp assembly and power module are both situated in a drawer which is removably inserted into the base of the reader to form an air-restricted path for the efficient convection of heat away from the reader. By setting the lamp at an angle to the longitudinal axis of the drawer, both the lamp assembly and power module components can fit in the drawer. The front end of the drawer is provided with a grille for air passage, and a chimney structure is situated adjacent the rear of the drawer for the efficient evacuation of heat. The lamp and power module are located below the chimney, and as the lamp and power module components heat the surrounding air, the air rises up the chimney and out of the reader by convection. This air movement creates a draft through the grille in the front of the drawer, which serves to sufficiently cool the components.
REFERENCES:
patent: 2060560 (1936-11-01), Ellis
patent: 2701979 (1955-02-01), Pratt et al.
patent: 3320854 (1967-05-01), Wally
patent: 3885867 (1975-05-01), Nelson et al.
Dueck Richard
Hechimovich Nick
Lehto Eino M.
Persha Thomas J.
Bell & Howell Company
Samlan Alan B.
Stephan Steven L.
Thibault Harry G.
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